.NET Calendar Control is a control similar to
Windows.Forms.MonthCalendar, but it adds support
for multi-select. It provides a point and click
interface for selecting holidays or special days.
It previously extended MonthCalendar, but now it
has a fixed size in all regions and handles all
drawing internally. The assembly contains several
small controls for building calendar interfaces.
These parts are independent of each other, and are
constructed with inheritance in mind.

123 Live Help is a Web-based support software for businesses. It shows visitors to your Web site that a live agent is just a click away and enables operators to chat in real time with them. There are text and video chat options. It is secure, fast, flexible, customizable, and cost-effective. There is a full-featured administrative panel for operators and administrators, allowing them to automatically detect customers' details, track their footprints, transfer chats, follow the visitor's Web browsing, check spelling, get canned messages, and more. Administrators also can monitor all chat sessions and get statistics on the traffic sources of visitors and performance of operators.

1VideoConverence is Web2.0 audio-video conference
call software for Asterisk with support for Web,
phone, MSN, Skype, Yahoo, and Jabber clients. This
VoIP and VVoIP conferencing app for business,
government, education, and health care is based on
C#, WinFX, XAML, and .NET 3.0.

Af-Arch is an N-tier development framework to quickly build high-quality distributed applications. It currently supports C and C# programming languages, which enables you to write client applications using them. It currently runs on GNU/Linux and Microsoft Windows, and is being used in production environments.

AIMLBot (Program#) is a small, fast,
standards-compliant yet easily customizable .NET
DLL implementation of an AIML (Artificial
Intelligence Markup Language) based chatter bot.
It boasts cross-platform compatibility, a modular
architecture, a simple and logical API, standards
compliant AIML support with the option for
extensions via custom tags, very small size
(currently only 56k), and very fast performance
(over 30,000 categories processed in under a second).

Accord.NET provides statistical analysis, machine learning, image processing, and computer vision methods for .NET applications. The Accord.NET Framework extends the popular AForge.NET with new features, adding to a more complete environment for scientific computing in .NET.

Agnos is a cross-language, cross-platform, lightweight RPC framework with support for passing objects by value or by reference. Agnos is meant to allow programs written in different languages to easily interoperate, by providing the needed bindings (glue-code) and hiding all the details from the programmer. The project essentially serves the same purpose as existing technologies like SOAP, WSDL, CORBA, and others, but takes a minimalistic approach to the issue at hand. Unlike the aforementioned technologies, which tend to require integration with Web servers, using verbose XML-based protocols on top of textual transports (HTTP), often also requiring complex topologies (such as name servers for registering objects, etc.). Agnos is designed to be simple, efficient, and straightforward, allowing for direct communication between two ends using a compact binary protocol.

Alligator is an RSS aggregator. It supports all RSS formats (Rich Site
Summary, RDF Site Summary, Really Simple Syndication) and Atom. It has
a simple, clean, user-friendly interface and an embedded Gecko-based
browser.